![Steven Cowley: Fusion is energy's future](https://pi.tedcdn.com/r/pe.tedcdn.com/images/ted/137261_800x600.jpg?h=200)
Physicist Steven Cowley is certain that nuclear fusion is the only truly sustainable solution to the fuel crisis. He explains why fusion will work -- and details the projects that he and many others have devoted their lives to, working against the clock to create a new source of energy.